<template>
    <div class="login_container">
        <div class="login_box">
            <!-- 头像区域 -->
            <div class="avatar_box">
                <img src="../assets/logo.png" alt="">
            </div>
            <!-- 登陆表单区域 -->
            <el-form ref="loginFormRef" :model="loginForm" :rules="loginFormRules" label-width="0px" class="login_form">
                <!-- 用户名 -->
                <el-form-item prop="username">
                    <el-input v-model="loginForm.username" prefix-icon="iconfont icon-yonghu"></el-input>   
                
                </el-form-item>
                <!-- 密码 -->
                <el-form-item prop="password">
                    <el-input v-model="loginForm.password" prefix-icon="iconfont icon-suo"
                    type="password"></el-input>
                    
                </el-form-item>
                <!-- 按钮 -->
                <el-form-item class="btns">
                    <el-button type="primary" @click="login">登录</el-button>
                    <el-button type="info" @click="resetLoginForm">重置</el-button>
                </el-form-item>
                
            </el-form>
        </div>
    </div>
</template>

<script>
export default {
    data(){
        return{
            //这是登陆表单的数据绑定对象
            loginForm:{
                username:'admin',
                password:'123456'
            },
            //这是表单的验证规则对象
            loginFormRules:{
                //验证用户名是否合法
                username:[ 
                    { required: true, message: '请输入登录名称', trigger: 'blur' },
                    { min: 3, max: 10, message: '长度在 3 到 10 个字符', trigger: 'blur' }
                    ],
                //验证密码是否合法
                password:[
                    { required: true, message: '请输入密码', trigger: 'blur' },
                    { min: 6, max: 15, message: '长度在 6 到 15 个字符', trigger: 'blur' }
                ]
            }
        }
    },
    methods:{
        //点击重置按钮，重置登陆表单
        resetLoginForm(){
            // console.log(this)
            this.$refs.loginFormRef.resetFields();
        },
        login(){
            this.$refs.loginFormRef.validate( async valid =>{ 
                // 
                if(!valid) return;
                const {data:res} = await this.$http.post('login',this.loginForm);
                // console.log(res)
                if (res.meta.status !==200) return this.$message.error('登录失败！');
                this.$message.success('登录成功');

                
                //1.将登陆成功之后的token保存到客户端的sessionStorsessage中
                //1.1 项目中出了登录之外的其他API接口，必须在登录之后才能访问
                //1.2 token只应在当前网站打开期间生效，所以将token保存在sessionStorsessage中
                window.sessionStorage.setItem('token',res.data.token);
                //2. 通过编程式导航跳转到后台主页，路由地址是 /home
                this.$router.push('/home')
                })
        }
    }
}
</script>

<style lang="less" scoped>
.login_container{
    background-color: #2b4b6b;
    height: 100%;
}

.login_box{
    width: 450px;
    height: 300px;
    background-color: #fff;
    border-radius: 3;
    position: absolute;
    left: 50%;
    top: 50%;
    transform: translate(-50%,-50%);
}
.avatar_box{
    border: 1px solid #eee;
    border-radius: 50%;
    height: 130px;
    width: 130px;
    padding: 10px;
    box-shadow: 0 0 10px #edd;
    position: absolute;
    left: 50%;
    transform: translate(-50%,-50%);
    background-color: #fff;
    img{
        width: 100%;
        height: 100%;
        border-radius: 50%;
        background-color: #eee;
    }
}

.login_form{
    position: absolute;
    bottom: 0;
    width: 100%;
    padding: 0 20px;
    box-sizing: border-box;
}

.btns{
    display: flex;
    justify-content: flex-end;
}
</style>
